EP 0774813 B1 20020807 - A spark plug for use in an internal combustion engine
Title (en)
A spark plug for use in an internal combustion engine
Title (de)
Zündkerze zur Anwendung in einem Verbrennungsmotor
Title (fr)
Bougie d'allumage pour moteur à combustion interne
Publication
Application
Priority
- JP 29838195 A 19951116
- JP 28978996 A 19961031
Abstract (en)
[origin: EP0774813A1] In a spark plug in use for an internal combustion engine, a ground electrode is secured to a front end of the metal shell so that a front end surface of the ground electrode faces an elevational side of a front end of the center electrode to cause semi-creeping spark discharges therebetween along a front end surface of the insulator. A front end portion of the center electrode has an electrode base in the axial bore and an electrode front defined diametrically smaller than the electrode base by way of a diameter-variable portion. A diametrical difference between an initial point of the diameter-variable portion of the center electrode and the axial bore of the insulator is 1 mm or less, and the initial point of the diameter-variable portion is retracted by 0.0 mm - 1.0 mm from the front end surface of the insulator. <IMAGE>
IPC 1-7
IPC 8 full level
H01T 13/14 (2006.01); H01T 13/20 (2006.01); H01T 13/52 (2006.01)
CPC (source: EP US)
H01T 13/14 (2013.01 - EP US); H01T 13/52 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0774813 A1 19970521; EP 0774813 B1 20020807; DE 69622818 D1 20020912; DE 69622818 T2 20021128; JP 3272615 B2 20020408; JP H09199260 A 19970731; US 5929556 A 19990727
DOCDB simple family (application)
EP 96308272 A 19961115; DE 69622818 T 19961115; JP 28978996 A 19961031; US 74676696 A 19961115